Seiko Cal. Y301A and Y302A Parts Catalogue and Technical Guide
Complete parts catalogue and technical guide for Seiko Cal. Y301A and Y302A quartz watch movements. This service manual covers everything needed for workshop-level maintenance and repair, including detailed exploded views with systematic part numbering for quick component identification. Disassembly and reassembly procedures walk you through safe handling and precise reinstallation, while dedicated lubrication specifications ensure proper operation of all bearing surfaces and escapement components. Electronic circuit reset switch information helps diagnose and resolve timing issues. Technical data for both calibers include movement diameters (Ø20.0 mm for Y301A, Ø23.0 mm for Y302A), height, battery specification (1.55V), three-jewel bearing arrangement, and complete time indication system details. An essential reference for watch repair technicians, horologists, and serious hobbyists working with these common Seiko quartz movements.
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Document Details
- Format
- Pages
- 6
- Size
- 375.4 KB
- Category
- Watchmaking